Sectional crank-shaft.



struction of this inven'tion will be specifically referred form, proportion apd minor details o construction' of the invention or sacrificing and Fig. 2 is a sectional view on the line 2 -2 ofFig. l.

' UNITED sTATFs To all whom it may. concern: l

Be it known that I, ALBERTI?. ROCKWELI, a citizen of thel United States, residing at Bristol, county of Hartford, State of Connecticut, have invented a certain 'new and useful'Sectional Crank-Shaft,v ofvwhich the following is a full, clear, and exact description, such as will enable others sk illedA in theartto which it appertains to make and use the same, referencebeing had to the accompanying drawings, `forming part of this specification.

This invention relates to the general classes of crankl shafts, but it is particularly adapted for use in connecconverting a reciprocatory motion oi the piston, ',or other power imparting device, to a rotary motion through the medium of 'a rotary shaft.

Heretoiore it has generallybeen the practice, where one or more cranks are arranged intermediate the ends of the shaft, to connect theY pitman' lto the crank by a sectional box on the end of the pitman. I am enabledto provide a solid pitman box on the end of the p itman, as for example, by providing an enlargement or head and boring a suitable opening therein for the reception of the crank. I also provide means for permitting parts of lthe crank-shaft to be removed for repairs, or forother purposes, and I am enabled to do this by providing a sectional crank-shaft without appreciably reducing its strength or eliminating anyof the advantages of the solid crank-shaft. I alsoprovide means whereby lengthy crank-shafts may be transportedin a convenient manner, and so that the sections may be set up when the motor or engine is being assembled.

Other advantages as well as the novel details of `conto hereinafter, it being understood that changes in may be resorted to without departing from' the. spirit any of the advantagesl thereof. l

In the drawings: Figure l illustrates a side eleva' tional view partly in section, ot the crank-shaft, -its standards or bearings and pitmen connected thereto;

In the drawings which illustrate a simple form of my invention, l designates the standards or bearings of which there are three shown, although any number may be used to su'it the length and requirements of the 4 crank-shaft.- Each of these standards is provided with a removable cap-piecev2, which in conjunction with the shaft-receiving lportion, its standard ,1, serves to form a bearing for the shaft and will normally retain the shaft against lateral displacement, said cap-piece, or pieces, may be removed in order to displace or assemble the shaft. These standards will tendto'be ar'- Y Specification of Letters Patent. I Application tiled December 19,

ATFNTl OFFICE.

CONNECTICUT, ASSIGNOR TO THE NEW DEPARTURE BRISTOL, CONNECTICUT, A CORPORATION OF CON- SECTIONAL CRANE-SHAFT.

'Patented Aug. 13, 1907.

1905. SerialNo.292,442. Y

, ranged in alinement, so vthat the bearings will aline and thereby'reeeive and cause to aline the various sections of the. crank-shaft. The intermediate mem; ber 3, of the crankshaft, is illustrated as having oppositely disposed crank-arms 4 and 5 respectively, said crankarms having right-angled disposed shafts ortubular projections 6 and 7 arranged ncar their ter- -minals, said tubular projections G and.7 being provided to receive the pins S'and 9, on the crank-arms l0 and "ll, of the shaftsections l2 and 13 respectively. It will .be4obvious that the pins 8 and 9 extendapproximatoly th ough the sleeves 6 and 7, and that the sleeves 6 and Vtion with motors wherein the pitman is utilized torba/fare of lengths equal to the lengths of the pins 8 and 9,

and the advantage of this is that when the parts aEV assembled, both the sleeves and the pins are supported at their respective ends as well as at their intermediate portions. Therefore, when the sections are assembled, the connecting portions formed by the pins 8 and 9 and the sleeves 6 and 7, will be in effect solid, and for all practical purposes, will be equal to resisting any strain put uponthe connection by the solid boxes I4 and l5, of the pitmen or piston rods 16 and 17. In other Words, the fact that the connections formed by the pins 8 and 9 and the sleeves 6 and 7, are sectional connections, will not reduce the resisting power oi the connections below what that would be if the connections were integral. By providing the boxes on the ends of the pitmen or piston-rods integral or unitary with vthe respective pitmen, any liability of the boxes working loose will be avoided, because the only way of disassociating th e pitman from the crank-shaft 'would be to remove the cap-piece 2, on the standards l, for no longitudinal movement of the crank-shaft will be permitted by the standards l, although the crank ,shaft may rotate or rock, as the case may be, in the usual manner common with such devices.

From the foregoing it will be seen that when it is necessary to repair a portion of'the crank-shaft for any reason, Vthe part to-be repaired may be removed with out removing. the-entire crank-shaft. This is particularly advantageous where a plurality of pistons are connected to a pluralityhoi cranks on a single shaft.

1. A crank-shaft comprising an vintermediate member having crank-arms thereon, tubular projections carried by said crank-arms, and complementary members of the crank-shaft having projections for engagement with the tubular projections on the intermediate member.

2. The combination with a sectional crank-shaft member having a tubular projection, of a pitman having a unitary head comprising a box into which the said tubular projection projects, a complementary crank-shaft member extending longitudinally within the tubular projection, and bearings in which the crankshaft members are journaled, said bearings preventing longitudinal play of the crank-shaft members.

, projection, and bearings in which the crank-shaft membersv` are Journale@ said bearings preventing longitudinal play of the crank-shaft members. 4. The combination with asectonal crank-`shaft-member .having a tubular projection, of a complementary crankshaft member extending longltudinully within the tubular projection, bearings in which the crankshaft members are journaled, and shoulders on the crank-shaft members and` coiiperating with the bearings to prevent longitudinal play ofthe crankshaft-members,

In testimony.wheieof,- Iv hereunto alx my signature, in thc presence of two Witnesses.-

,- 'v ALBERT F. noCKWELL.`

Witnesses:v 

